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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="/programming-interfaces/main.css">
</head>
<body>
<script src="/programming-interfaces/dist/elm.js"></script>
<script src="https://cdn.jsdelivr.net/pyodide/v0.25.0/full/pyodide.js"></script>
<div id="visited-info">
<p><b>Thank you for your interest!</b></p>
<p>We do not have any further tasks for you in this study.</p>
<p>Please feel free to exit this webpage now.</p>
</div>
<div id="myapp"></div>
<script>
var visitedInfo = document.getElementById("visited-info");
visitedInfo.className = "hide"
var storedState = localStorage.getItem('flag');
var visited = storedState ? JSON.parse(storedState).visited : false;
if (visited) {
visitedInfo.className = "show";
} else {
var storedId = localStorage.getItem('userID');
const userID = storedId ? storedId : self.crypto.randomUUID();
localStorage.setItem('userID', userID);
var app = Elm.Main.init({flags: [userID, visited]});
var socket = new WebSocket('wss://echo.websocket.org');
var errorSocket = new WebSocket('wss://echo.websocket.org/error');
var pyodide = null
app.ports.storeFlag.subscribe(function(flag) {
if (flag.length > 0) {
localStorage.setItem('flag', flag);
}
});
async function runCode(code) {
if (pyodide == null) {
pyodide = await loadPyodide({packages: ["numpy"]});
pyodide.setStdout({ batched: (msg) => socket.send(msg) })
}
const emptyMap = pyodide.toPy({});
const emptyScope = {globals: emptyMap, locals: emptyMap};
try {
pyodide.runPython("import numpy as np\n" + code, emptyScope);
} catch (err) {
errorSocket.send(err.message)
}
}
app.ports.sendCode.subscribe(async function(message) {
const result = await runCode(message);
});
socket.addEventListener("message", function(event) {
app.ports.resultReceiver.send(event.data);
});
errorSocket.addEventListener("message", function(event) {
app.ports.errorReceiver.send(event.data);
});
}
</script>
</body>
</html>